Transportation Commons^™

Tls Newsletter August 2015, Unf Transportation And Logistics Society

Transportation & Logistics Society Newsletter

Inside the Newsletter: TLS Kick Off Meeting Wednesday September 16. TLS President's Corner. Get to Know Adrian Ross, TLS Newsletter Editor. Upcoming Events. TLS on Tour--Fanatics Fulfillment Center. How do Recruiters Find the Right Candidates in the Digital Age? Life After Graduation with Zach Dubs

Improved Safety Performance Functions For Signalized Intersections, Karen Dixon, Christopher Monsere, Raul Avelar, Joel Stephen Barnett, Paty Escobar, Sirisha Murthy Kothuri

Civil and Environmental Engineering Faculty Publications and Presentations

For this effort, the research team developed new safety performance functions (SPFs) for signalized intersections in Oregon. The modeling dataset consisted of 964 crashes from a total of 73 intersections that were randomly selected based on the presence of a traffic signal (identified through the crash data records). The SPFs were developed using a Poissonlognormal Generalized Linear Mixed model framework for total crashes and severe injury crashes (coded as KAB). Three SPFs were developed: 1) an SPF for total crashes, which relies on both major and minor AADTs to predict the expected number of crashes; 2) an SPF for KAB …

Cooperation In Delay-Tolerant Networks With Wireless Energy Transfer: Performance Analysis And Optimization, Dusit Niyato, Ping Wang, Hwee-Pink Tan, Walid Saad, Dong In Kim

Research Collection School Of Computing and Information Systems

We consider a delay-tolerant network (DTN) whose mobile nodes are assigned to collect packets from data sources and deliver them to a sink (i.e., a gateway). Each mobile node operates by using energy transferred wirelessly from the gateway. For such a network, two main issues are studied. First, when a mobile node is at the data source, this node must decide on whether to accept the packet received from the data source or not. In contrast, whenever a mobile node is at the gateway, it has to decide on whether to transmit the packets collected from the data sources or …

Development Of Bus-Stop Time Models In Dense Urban Areas: A Case Study In Washington Dc, Stephen Arhin, Errol Noel

Mineta Transportation Institute

Bus transit reliability depends on several factors including the route of travel, traffic conditions, time of day, and conditions at the bus stops along the route. The number of passengers alighting or boarding, fare payment method, dwell time (DT), and the location of the bus stop also affect the overall reliability of bus transit service. This study defines a new variable, Total Bus Stop Time (TBST) which includes DT and the time it takes a bus to safely maneuver into a bus stop and the re-entering the main traffic stream. It is thought that, if the TBST is minimized at …

Neighborhood Crime And Transit Station Access Mode Choice - Phase Iii Of Neighborhood Crime And Travel Behavior, Christopher E. Ferrell, Shishir Mathur, Bruce S. Appleyard

Mineta Transportation Institute

This report provides the findings from the third phase of a three-part study about the influences of neighborhood crimes on travel mode choice. While previous phases found evidence that high levels of neighborhood crime discourage people from choosing to walk, bicycle and ride transit, consistent with the authors’ hypothesis, they also produced counterintuitive findings suggesting that in some cases, high crime neighborhoods encourage transit ridership at the expense of driving—the opposite of what common sense would suggest. Phase 3 tested possible explanations for these counterintuitive findings with a series of methodological improvements. These improvements were:

• Improvement 1: Used the Bay …

Advanced Low-Floor Vehicle (Alfv) Specification Research, Suresh Iyer, Partha Mishra, David Klinikowski, Boyd Thompson, Myra Strange, Wanda Boggs, Carl Thornblad

Mineta Transportation Institute

This report details the results of research on market comparison, operational cost efficiencies, and prototype tests conducted on a novel design for an Advanced Low Floor Vehicle (ALFV), flex-route transit bus. Section I describes how the need for such a bus arises from a combination of diminishing transit funding from the federal government and demographic and transportation factors. Section II describes the unique features of this bus design that render it suitable for rural and urban operation, including improved transit passenger and wheelchair accessibility, reduced maintenance, structural design features, safety provisions, and the technical specifications of this design. Section III …

On Mining Lifestyles From User Trip Data, Meng-Fen Chiang, Ee-Peng Lim

Research Collection School Of Computing and Information Systems

Large cities today are facing major challenges in planning and policy formulation to keep their growth sustainable. In this paper, we aim to gain useful insights about people living in a city by developing novel models to mine user lifestyles represented by the users' activity centers. Two models, namely ACMM and ACHMM, have been developed to learn the activity centers of each user using a large dataset of bus and subway train trips performed by passengers in Singapore. We show that ACHMM and ACMM yield similar accuracies in location prediction task. We also propose methods to automatically predict "home", "work" …

Robust Observability, Control, & Economics Of Complex Cyber-Physical Networks, Shaurya Agarwal

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation deals with various aspects of cyber-physical system. As an example of cyber physical systems, we take transportation networks and solve various problems, namely: 1) Network Observability Problem, 2) Network Control Problem, and 3) Network Economics Problem. We have divided the dissertation into three parts which solve these three problems separately. First part of the dissertation presents a novel approach for studying the observability problem on a general network topology of a traffic network. We develop a new framework which investigates observability in terms of flow information on arcs and the routing information. Second part of the dissertation presents …

Go By Transit! Out-Of-Town Adventures On Local Public Transportation, Linn Davis

Metroscape

Linn Davis recounts his epic public-transit journeys to far-flung areas of the metroscape, and the surprising discoveries he made along the way.

Make Way For The Orange Line And A Milwaukian Renaissance, Ben Maras

Metroscape

Ben Maras describes how residents of Milwaukie, Oregon feel about the new TriMet Orange Line that will surely bring change to this city just over 20,000.

Using Visual Data Mining In Highway Traffic Safety Analysis And Decision Making, Yao-Te Tsai, Huw D. Smith, Stephen M. Swartz, Fadel M. Megahed

Journal of Transportation Management

An ongoing, two-fold challenge involves extracting useful information from the massive amounts of highway crash data and explaining complicated statistical models to inform the public about highway safety. Highway safety is critical to the trucking industry and highway funding policy. One method to analyze complex data is through the application of visual data mining tools. In this paper, we address the following three questions: a) what existing data visualization tools can assist with highway safety theory development and in policy-making?; b) can visual data mining uncover unknown relationships to inform the development of theory or practice? and c) can a …

Enhancing Competitiveness And Connectivity: The New Us-Mexico Air Services Agreement, Drew M. Stapleton, Vivek Pande

Journal of Transportation Management

Beginning this year, U.S. cargo and passenger airlines will have an opportunity to compete for a bigger share of freight trade and traffic between the U.S. and Mexico. This opportunity will occur as a result of the new Air Services Agreement (ASA) between the U.S. and Mexico that took effect in January, 2016. This ASA further elevates and strengthens the dynamic commercial and economic relationship between the United States and Mexico by facilitating greater trade and tourism. It is a key element of the U.S.-Mexico High Level Economic Dialogue (HLED) that aims to promote competitiveness and connectivity, foster economic growth, …

Identifying The Dimensions Of Logistics Service Quality In An Online B2c Context, David M. Gligor

Journal of Transportation Management

There is theoretical and practical evidence indicating the existence of significant differences between the needs and wants of firms and end consumers, as well as the existence of significantly different needs between offline and online environments. Therefore, it is not clear how effectively measures of logistics service quality developed in an offline, B2B context can be applied to an online, B2C environment. This manuscript explores the elements of logistics service quality that end consumers value in an online context. The literature on logistics service quality in B2B and the literature on online consumer satisfaction are integrated. This results in the …

Logistics Concepts In Freight Transportation Modeling, Subhro Mitra, Elvis Ndembe, Poyraz Kayabas

Journal of Transportation Management

The purpose of this paper is to review logistics concepts used in macro freight transportation modeling by various planning agencies at the national, state and city level. The chronological development of freight modeling endeavors are studied here and the logistics component incorporated in the modeling is identified. The key modeling tools are identified and analyzed to identify the efficacy of the model, ease of use, and data required to implement the model. The conclusion was that European freight models were more developed than North American freight models. The tools most widely used are the aggregate-disaggregate-aggregate model, input-output model, artificial neural …

Promoting Intermodal Connectivity At California’S High-Speed Rail Stations, Anastasia Loukaitou-Sideris, Deike Peters, Wenbin Wei

Mineta Transportation Institute

High-speed rail (HSR) has emerged as one of the most revolutionary and transformative transportation technologies, having a profound impact on urban-regional accessibility and inter-city travel across Europe, Japan, and more recently China and other Asian countries. One of HSR’s biggest advantages over air travel is that it offers passengers a one-seat ride into the center of major cities, eliminating time-consuming airport transfers and wait times, and providing ample opportunities for intermodal transfers at these locales. Thus, HSR passengers are typically able to arrive at stations that are only a short walk away from central business districts and major tourist attractions, …

Toward A Spatial-Temporal Measure Of Land-Use Mix, Steven R. Gehrke, Kelly Clifton

Civil and Environmental Engineering Faculty Publications and Presentations

Urban planning and public-health research has long been interested in the connection between land-use mix and travel. Interest from urban planners stems from the potential of transportation efficiency gains achieved by an increased land-use mix and subsequent shortening of trip lengths; whereas, public-health research advocates an increased land-use mix as an effective policy for facilitating greater physical activity. Yet, despite the transportation, land-use, and health benefits related to improving land-use mix and the extent of topical attention given by researchers, no consensus has been reached regarding the magnitude of its effect on travel. This absence of agreement may largely be …

The Benefits Of Transit In The United States: A Review And Analysis Of Benefit-Cost Studies, Christopher E. Ferrell

Mineta Transportation Institute

This white paper presents the findings from a review and analysis of the available literature on benefit-cost (b-c) estimates of existing U.S. transit systems. Following an inventory of the literature, the b-c estimates from each study were organized according to the type of study area (e.g., rural, small urban, urban, etc.). Through this process, categories of monetary transit benefits were identified. The estimated dollar value for each benefit category was divided by the total estimated costs of providing the transit services, thus creating a benefit-specific b-c ratio for each category and allowing benefits from each study to be compared on …

Fast Optimal Aggregate Point Search For A Merged Set On Road Networks, Weiwei Sun, Chong Chen, Baihua Zheng, Chunan Chen, Liang Zhu, Weimo Liu, Yan Huang

Research Collection School Of Computing and Information Systems

Aggregate nearest neighbor query, which returns an optimal target point that minimizes the aggregate distance for a given query point set, is one of the most important operations in spatial databases and their application domains. This paper addresses the problem of finding the aggregate nearest neighbor for a merged set that consists of the given query point set and multiple points needed to be selected from a candidate set, which we name as merged aggregate nearest neighbor(MANN) query. This paper proposes two algorithms to process MANN query on road networks when aggregate function is max. Then, we extend the algorithms …

What Do Americans Think About Public Transit? A Review Of U.S. Public Opinion Polling Survey Questions, Asha W. Agrawal

Mineta Transportation Institute

This “seed grant” research project compiled a set of 56 US public opinion polls that asked respondents their opinions about public transit. The first and primary goal of the project was to assemble a large set of transit-related survey questions that can be used to inspire the design of future surveys on the topic of public transit. The report presents the specific wording of every relevant question identified.

A second objective of the project was to identify general patterns in public opinion about transit that emerge across multiple surveys. Reviewing the entire set of polling questions related to public transit …

Plenary Session Iii – Policy Track: Focus On Innovation, Emily Shea, Jessica Cicchini, Bryan Reimer, Meghan Verena Joyce, Nora Moreno Cargie, Betsey Crimmins

Older Driver Safety Summit: Planning a Safe and Mobile Future for Massachusetts

Dr. Cicchini will describe the Insurance Institute for Highway Safety and how its work can inform efforts in Massachusetts to promote older driver road safety. Dr. Reimer will describe innovations in research and the implications for policy. Nora Moreno Cargie will discuss how corporate and philanthropic partners can support innovative policy developments. Meghan Verona Joyce will describe Uber’s innovative partnership with government partners as a model for other entities to consider as they face regulatory challenges. Betsey Crimmins will discuss the legal and elder justice innovations needed to keep older MA adults safe and mobile.